Die head



' Dec. 30, 1924- 1,520,871

' v. R. KQONTZ 'DIE HEAD Filed July 26, 1921 3 Sheets-Sheet 1 Dag, 30, 192.4.

11,520, 71 v. R. 'KOONTZ v DIE HEAU' Filed July 26. 1921 3' Sheets- Sheet 2 Patented Dec. 30, 1924.

UNITED STATES PATENT OFFICE.

VIC'IOBR. KOONTZ, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR, BY-MESNE ASSIGN- MENTS, T0 LANDIS MACHINE COMPANY, OF WAYNES'BORO, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

nrn HEAD.

,Application filed: July 26, 1921. Serial No. 487,652.

To all whom it may concern:

Be it known that I, VICTOR R. KOONTZ, a citizen of the United States residing at Waynesboro, in the county of Franklin and State of Pennsylvania, have invented certain new and useful Improvements in Die Heads, of whichthe following is a specification.

The present invention relates to threading die heads of the expansible type, and one of the principal objects is to provide a combination of elements that will effectively hold the cutters against creeping or in other words against any outward'movement due to the strain or' pressure of the work and the cutting action. With many structures of this type ithas been-found that under the strain there isapt to be a slight.

give between the various elements, resulting in the production of a tapered thread, and this is entirely overcome in the present device;

A further and important object is the provision of simple but very effective means for securing the chasers on the holders, yet permitting their ready detachment. i a

In the accompanying drawings Figure 1 is a side elevation of a head constructed in accordance with the present invention, I

Figure 2 is a front elevation of the same, with one of the cutter holders complete, a second with part of the elements removed,

" a third cutter holder being shown in section,

and with the fourth cutter holder entirely removed,

Figure 3 is a longitudinal sectional view through the structure, taken on the line 33 of Figure 2, but showing all the parts in place,

Figure and casing, the body and tached therefrom,

Figure 5 is a rear elevation of the body and actuating ring, I

Figure 6 is a perspective view of one of the cutter holders, I

Figure 7 is a rear elevation of the same, Figure 8 is a detail sectional view substantially on the line 88 of Figure 4, but with the body and actuatingring assembled, Figure 9 is a cross sectional view" on the line 9-9 of Figure 4,

4 is a front elevation of the stobk ring being de- Figure 10 is a sectional view on the line 10--10 of Figure 5,

buts owing the actuating ring in unlocked posltion.

In the embodiment disclosed, a tubular stock 12 is employed, having a flanged portion 13 at its front end, in which is slidably Figure 11 is a view similar to Figure 8,

bearings for coiled springs 21 surrounding the screws within the sockets 19 and bearing against the bottoms of said sockets. The

screws limit the, outward movement of the body 14, and the springs 21 serve to-return the body after its forward movement.-

Rotatably mounted on the body 14 is an actuating ring 22 which may be held there-.

on by screws'23, one of which is shown in. Figure 5, said screws" being threaded through the ring and having terminal pins 24 at their inner ends that engage blocks 25 slidably mounted in grooves26 formed 1n the periphery of the body 14. 'Tlie front faces of the body14 and actuating ring 22 are flush, and located over said front faces are cutter or chaser carriers comprising bodies 27, preferably having integral pintles 28 that are ournaled in openings 29 formed in the bodv 14. As illustrated more particularly in Figure .10 the openings 29 extend entirely through the body 14 and the pintles 28 have retaining disks 30 secured on their rear ends b screws 31. The cutter holders arev provided with longitudinally disposed slots 32 in line with the pintles 28,

as indicated in Fig. 2 and shown in Fig. 101 In these slots 32 the chasers 33 are slidably mounted, these chasers being'borne against at their rear 'endsbyadjustable abutment screws 34. The chasers are provided on their outer portions with shoulders 35, upon which are adapted to rest retaining plates 39 threaded into the cutter holders. As will be clear particularly by reference to Figure 2 the holding plates are adapted to be moved to a position where they will overhang the slots and rest on the shoulders 35 of the chasers, being held therein by the clamping screws 89. By loosening said screws 39, the

' plates can be moved backwardly, so as to be entirely at one side of the slots, thus permitting the free removal of the chasers.

The rear sides of the cutter holders are generally in concave form, providing cam surfaces and the actuating ring 22 is provided with outstanding lugs 41 that overhang the margins of the body 14 and are provided with inner curved abutment faces 42 that bear against said cam surfaces 40. It will be noted in Figure 2 that the bearing points of the abutments 41 are directly behind and in line with the cutting ends of the chasers 33, transversely of the inner ends 7 .of said chasers forming a solid rigid backing for the active ends of said chasers. It will be clear that if the ring 22 is rotated in the direction indicated by the arrow in Figure 2, the abutments will cause the cutter holders 27 and the chasers carried thereby, to swing inwardly totheir operative positions. In order to move the cutter holders and chasers outwardly, upon the retrograde movement of the ring 22, said holders 27 are provided with slots 43, in which are engaged the outer ends of screws 44 threaded into the abutments 41, as illustrated in Figure 3. The slots 43 are covered by cap plates 45 and the abutments 41 and cam surfaces 40 are enclosed by covering strips 46.

The mechanism for effecting the rotation of the actuating ring 22-is preferably as follows. The actuating ring 22 is provided with an inwardly extending abutment lug 47 borne against by a coiled spring 48 that also bears against an abutment 49' fixed to the flanged portion 13 of the stock 12, the spring 48 thereby acting to turn the actuating ring in one direction. Mounted on the flanged portion 13 is a housing ring'50 that encloses the spring 48 and carries a pair of locking lugs 51. This housing ring 50 is normally fixed with respect to the stockbut can be adjusted by means of a pair of oppositely disposed screws 52 that bear against opposite sides-of a lug 53 fixed in the flange 13 of the stock 12. The lugs 51 thus constitute in effect a part of the stock. The actuating ring 22 is provided in its rear edge with oppositely arranged sockets 54, and these sockets are adapted to receive the lugs 51 when the actuating ring 22 has been turned in a direction to compress the spring When the lugs 51 aline' with these sockets 54 the springs 21 act tomove the actuating ring and body rearwardly, so that the lugs will enter said sockets. Furthermore when so turned and the lugs 51 are in the sockets 54 the cutter holders 27 are swung inwardly to their active positions by the abutments 41 operating against the cam faces 40. V

Assuming the parts'in the above described relation and as shown in the drawings, with the exceptionof Figure 11, the tool is in condition to thread and therefore if the work is introduced into the threading die the threads will be cut thereon. During this threading action the work is held against longitudinal movement and consequently the body 14 and actuating ring 22 will be drawn forwardly with respect to the stock. This in time will cause the locking lugs 51 to be disengaged from the sockets 54 and immediately on such disengagement the spring 48 will act to turn the locking ring in a direction to swing the cutter holders.27 and the chasers carried thereby outwardly, and thus release the work. The actuating ring 22 is preferably provided with a handle 55 by which the ring can be again turned in the opposite direction to aline the sockets 54 with the lugs 51, whereupon the springs 21 which have been compressed, will react and return the parts to their operative positions.

From the foregoing, it is thought that the construction, operatlon and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that Various' changes in the size, shape, proportion and minor details of construction, may be'resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent, is: 1. In a die head, the combination with relatively rotatable members, of means for effecting their relative rotation, a .cutte'r holder pivotally mounted on one of the members and having a cutter-receiving socket, and an abutment on the other member having a slidable bearing against the cutter holder behind and in a line with the cutting end of a cutter held in the socket of the holder and in the same plane with such socket and holder, said line being transverseto the cutter receiving socket and said abutment acting to effect the movement of the cutter holder and hold it in-a predetermined position.

' 2. In a die head, the combination with a body, of an actuating ring member rotatably mounted thereon, a cutter holder member pivotally mounted on the body, a cam surface on one of said members, an abutment in the slot to move the cutter holder outblock in the groove, and a slidably bearing against the respective cutter holders, a lock between the ring and stock on the other member slidably engaging the body when the cutter holders are in their accam surface, sald surface and abutment tive positions and so held by the abutments, being in the plane of a cutter held by the said lock releasing the ring on apredeter:

holder member and on the same side of the mined relative movement between the stock pivot axis of the holder as the cutting end and body, andaspring for rotating the ring of a cutter carried by the holder, and means when released to thereby move the abutment for rotatin the ring. toan inactive relation with respect to the 3. In a ie head, the combination with a cutter holders. body, of an actuating rin rotatably mounted thereon, a cutter hol er pivotally body, of a cutter holder pivoted on the mounted on the body and having means for body, said holder having a rear side and an holding a cutter with its cuttinlg end proinner end and an outer end and having jecting from one end of the 'ho der, a cam means for mounting a cutter thereon and the surface on. the cutter holder, an abutment pivot axis of the holder intersecting a cutter surface behind the cutter holder andexertthe rear side of the cutter holder and effecting a pressure against the cutter holder in ing .apressure against the same in a line a direction transverse to the longitudinal transverse to the inner end of the holder line of a tool held by the holder, and means and the cutting end of a cutter mounted for rotatin the ring. thereon for moving said cutter holder.

4. In a ie head, the combination with a 9. In a die head, the combination witha body, of a cutter holder pivotally mounted body, of a cutter holder an innerend porthereon and having a recessed rear portion tion provided with a rear side and also havat the, rear side of its inner end provided ing a longitudinal cutter receiving recess in with a cam surface, an actuating ring roits outer end and a transverse pivot in line tatably' mounted on the body and having an with the recess and engaged with the body, abutment block slidably engagin the cam and a cam operating against the rear side'of surface, and means for rotating te ring. the inner end portion of the holder to swing 5..In a die head, the combination with a the same inwardly. body, of a cutter holder pivotally mounted 10. In a die head, the combination with a thereon and having the rear side of its inner body having a central work-receiving openend recessed and provided. with a cam suring, of a plurality of cutter holders having face, an actuating ring rotatably mounted inner and outer ends and pivoted between on the body and having an abutment block said ends to the body on different sides of the slidably engaging the cam surface for movopening, said holders havin longitudinal ing the cutter holder inwardly, and aconrecesses for the reception 0 .cutters that nection between the ring and cutter holder project from their inner ends, means operto move the latter outwardly, and means for able at the outer ends of the holders for adrotating the ring.

6. In a die head, the combination with a dy, and cams carried by the r ng and body, of a cutter holder pivotally mounted operating transversely against the inner end thereon and having a recessed rear portion portions of the holders on the inner sides of provided with a cam surface, an actuatin their ivot axes for swinging said holders. ring rotatably mounted on the body an 11. n adie head, the combination with a having an abutment block slidably engaging body and an actuating ring rotatably the cam surface for moving the cutter holder mounted thereon, of a cutte'fholder movahly inwardly, said holder having a slot, and a mounted on the body and movable by the pin carried by the abutment and engaged ring, said body having a groove, a bearing wardly, and means for rotating the rin through the ring and having a terminal pin 7. In a die headfthe combination with a, en aged in an opening in'the block. stock, of a body slidabl mounted thereon, a I1 tes lm nywhereof, Ijlflix my signature lurality of cutter ho ders pivoted on the n h presence of w wltnessesv dy and having rear cam surfaces, a ring a rotatable on the body and having abutments VICTOR R. KOONTZ.

witrfis'sia sz for holding the ring against rotation on the Jorm H. Emo r'r.

8. In a die head, the combination with a 'on the ring that slidably engages the cam so mounted, and means operating against 'usting the cutters, a rotatable rin on the screw threaded 

